In the design of a graphic processing unit(GPU),the processing speed of triangle rasterization is an important factor that determines the performance of the GPU.An architecture of a multi-tile parallel-scan rasterizat...In the design of a graphic processing unit(GPU),the processing speed of triangle rasterization is an important factor that determines the performance of the GPU.An architecture of a multi-tile parallel-scan rasterization accelerator was proposed in this paper.The accelerator uses a bounding box algorithm to improve scanning efficiency.It rasterizes multiple tiles in parallel and scans multiple lines at the same time within each tile.This highly parallel approach drastically improves the performance of rasterization.Using the 65 nm process standard cell library of Semiconductor Manufacturing International Corporation(SMIC),the accelerator can be synthesized to a maximum clock frequency of 220 MHz.An implementation on the Genesys2 field programmable gate array(FPGA)board fully verifies the functionality of the accelerator.The implementation shows a significant improvement in rendering speed and efficiency and proves its suitability for high-performance rasterization.展开更多
A spontaneous mutation, tentatively named d63, was derived from the twin-seedling progenies of rice crossed by diploid SARIII and Minghui 63. Compared with wild-type plants, the d63 mutant showed multiple abnormal phe...A spontaneous mutation, tentatively named d63, was derived from the twin-seedling progenies of rice crossed by diploid SARIII and Minghui 63. Compared with wild-type plants, the d63 mutant showed multiple abnormal phenotypes, such as dwarfism, more tillers, smaller flag leaf and reduced seed-setting rate and 1000-grain weight. In this study, two F2 populations were developed by crossing between d63 and Nipponbare, d63 and 93-11. Genetic analysis indicated that d63 was controlled by a single recessive gene, which was located on the short arm of chromosome 8, within the genetic distance of 0.40 cM from RM22195. Hence, D63 might be a new gene as there are no dwarf genes reported on the short arm of chromosome 8.展开更多
步进频探地雷达具有灵敏度高、动态范围大、平均功率大等优点,设计并实现了一种基于射频片上系统芯片(radio frequency system on chip,RFSOC)的步进频探地雷达收发系统。该系统主要包含发射链路、接收链路、时钟单元、可程序化逻辑门阵...步进频探地雷达具有灵敏度高、动态范围大、平均功率大等优点,设计并实现了一种基于射频片上系统芯片(radio frequency system on chip,RFSOC)的步进频探地雷达收发系统。该系统主要包含发射链路、接收链路、时钟单元、可程序化逻辑门阵列(field programmable gate array,FPGA)控制系统以及数据传输单元等模块,通过设置发射端与接收端的数控振荡器(numerically controlled oscillator,NCO)多片同步从而实现载波同频同相,保证雷达收发信号的相位相干性,并在数据传输单元中设计接收时窗。实验测试结果表明,该系统能够实现频率范围200 MHz~2 GHz、步长2 MHz的步进频率信号发射和接收,能够实现对自由空间、沙坑以及沥青路面等多个场景目标的有效探测。展开更多
针对当前矢量数据组织方法在显示效率和效果方面存在的不足,提出了一种基于矢量瓦片的矢量数据组织方法。通过建立矢量瓦片的逻辑模型和物理模型,实现了基于瓦片的矢量数据表达;结合金字塔思想,实现了基于LOD的矢量瓦片调度。应用Open S...针对当前矢量数据组织方法在显示效率和效果方面存在的不足,提出了一种基于矢量瓦片的矢量数据组织方法。通过建立矢量瓦片的逻辑模型和物理模型,实现了基于瓦片的矢量数据表达;结合金字塔思想,实现了基于LOD的矢量瓦片调度。应用Open Street Map路网数据进行了相关实验,结果表明,该方法在保证矢量数据精度、便于制图和交互操作特性的同时,提高了数据调度效率,是行之有效的。展开更多
基金the Scientific Research Program Funded by Shaanxi Provincial Education Department(20JY058)。
文摘In the design of a graphic processing unit(GPU),the processing speed of triangle rasterization is an important factor that determines the performance of the GPU.An architecture of a multi-tile parallel-scan rasterization accelerator was proposed in this paper.The accelerator uses a bounding box algorithm to improve scanning efficiency.It rasterizes multiple tiles in parallel and scans multiple lines at the same time within each tile.This highly parallel approach drastically improves the performance of rasterization.Using the 65 nm process standard cell library of Semiconductor Manufacturing International Corporation(SMIC),the accelerator can be synthesized to a maximum clock frequency of 220 MHz.An implementation on the Genesys2 field programmable gate array(FPGA)board fully verifies the functionality of the accelerator.The implementation shows a significant improvement in rendering speed and efficiency and proves its suitability for high-performance rasterization.
文摘A spontaneous mutation, tentatively named d63, was derived from the twin-seedling progenies of rice crossed by diploid SARIII and Minghui 63. Compared with wild-type plants, the d63 mutant showed multiple abnormal phenotypes, such as dwarfism, more tillers, smaller flag leaf and reduced seed-setting rate and 1000-grain weight. In this study, two F2 populations were developed by crossing between d63 and Nipponbare, d63 and 93-11. Genetic analysis indicated that d63 was controlled by a single recessive gene, which was located on the short arm of chromosome 8, within the genetic distance of 0.40 cM from RM22195. Hence, D63 might be a new gene as there are no dwarf genes reported on the short arm of chromosome 8.
文摘步进频探地雷达具有灵敏度高、动态范围大、平均功率大等优点,设计并实现了一种基于射频片上系统芯片(radio frequency system on chip,RFSOC)的步进频探地雷达收发系统。该系统主要包含发射链路、接收链路、时钟单元、可程序化逻辑门阵列(field programmable gate array,FPGA)控制系统以及数据传输单元等模块,通过设置发射端与接收端的数控振荡器(numerically controlled oscillator,NCO)多片同步从而实现载波同频同相,保证雷达收发信号的相位相干性,并在数据传输单元中设计接收时窗。实验测试结果表明,该系统能够实现频率范围200 MHz~2 GHz、步长2 MHz的步进频率信号发射和接收,能够实现对自由空间、沙坑以及沥青路面等多个场景目标的有效探测。
文摘针对当前矢量数据组织方法在显示效率和效果方面存在的不足,提出了一种基于矢量瓦片的矢量数据组织方法。通过建立矢量瓦片的逻辑模型和物理模型,实现了基于瓦片的矢量数据表达;结合金字塔思想,实现了基于LOD的矢量瓦片调度。应用Open Street Map路网数据进行了相关实验,结果表明,该方法在保证矢量数据精度、便于制图和交互操作特性的同时,提高了数据调度效率,是行之有效的。
